What is the integral of 2/(9+16x^2) ?

The integral of 2/(9+16x^2) is 1/6 arctan(4/3 x)+C

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integral of 2/(9+16x^2)

\int \frac{2}{9 + 16 x ^{2}} d x

\frac{1}{6} arctan (\frac{4}{3} x) + C

Solution steps

\int \frac{2}{9 + 16 x ^{2}} d x

Take the constant out:

\int a \cdot f (x) d x = a \cdot \int f (x) d x

= 2 \cdot \int \frac{1}{9 + 16 x ^{2}} d x

Apply Integral Substitution

= 2 \cdot \int \frac{1}{12 ( u ^{2} + 1 )} d u

Take the constant out:

\int a \cdot f (x) d x = a \cdot \int f (x) d x

= 2 \cdot \frac{1}{12} \cdot \int \frac{1}{u ^{2} + 1} d u

Use the common integral:

\int \frac{1}{u ^{2} + 1} d u = arctan (u)

= 2 \cdot \frac{1}{12} arctan (u)

Substitute back

u = \frac{4}{3} x

= 2 \cdot \frac{1}{12} arctan (\frac{4}{3} x)

Simplify

2 \cdot \frac{1}{12} arctan (\frac{4}{3} x) : \frac{1}{6} arctan (\frac{4}{3} x)

= \frac{1}{6} arctan (\frac{4}{3} x)

Add a constant to the solution

= \frac{1}{6} arctan (\frac{4}{3} x) + C

\int (x^{2} - 1)^{3} 2 x d x

\int \frac{2 x ^{3} + 2 x ^{2} + x + 1}{x ^{2} + x} d x

\int 1 - sin^{2} (2 x) d x

\int \frac{1}{6 ^{x}} d x

\int \frac{3}{3 y} d y

What is the integral of 2/(9+16x^2) ?
The integral of 2/(9+16x^2) is 1/6 arctan(4/3 x)+C